Original tekst: Grieg & Mendelssohn. Lyric Pieces, Book IV - Valse-Impromptu, Op. 47, No. 1. Complete Works For Piano. Version 2.0. Edvard Grieg.
Oversættelse: Grieg. Lyric Pieces, bog IV - Valse-Impromptu, Op. 47, nr. 1. Lyric Pieces, Book IX - Valse Melancholique, Op. 68, nr. 6.